Watlow EZ-ZONE PM User Manual download pdf (Page 78)

Watlow EZ-ZONE

PM Limit Controller • 75 • Chapter 8 Features

10. ReadElectricalMeasurementvalue[`Mu] of controller via EZ-Configurator or RUI. This will be re-

ferred to as Electrical Measured High. Record high value ______________

11. CalculatedElectricalInputSlope=(PrecisionHigh–PrecisionLow)/(ElectricalMeasuredHigh-Elec-

trical Measured Low). Calculated Slope value ___________

12. CalculatedElectricalInputOffset=PrecisionLow–(ElectricalInputSlope*MeasuredLow).Calculated

Offset value ___________

13. EnterthecalculatedElectricalInputSlope[ELi;S] and Electrical Input Offset [ELi;o] into the control-

ler.

14. Exitcalibrationmenu.

15. Validatecalibrationprocessbyutilizingacalibratortotheanaloginput.

16. Entercalibrationoffsetasrecordedinstep2ifrequiredtocompensateforsensorerror.

Setting Electrical Input Slope [ELi;S]to1.000andElectricalInputOffset[ELi ;o] to 0.000, restores factory

calibration as shipped from factory.

Filter Time Constant

Filtering smoothes an input signal by applying a first-order filter time constant to the signal. Filtering the

displayedvaluemakesiteasiertomonitor.FilteringthesignalmayimprovetheperformanceofPIDcontrol

in a noisy or very dynamic system.

Adjust the filter time interval with Filter Time [`FiL] (Setup Page, Analog Input Menu).

Example:Withafiltervalueof0.5seconds,iftheprocessinputvalueinstantlychangesfrom0to100andre-

mainedat100,thedisplaywillindicate100afterfivetimeconstantsofthefiltervalueor2.5seconds.

Sensor Selection

Youneedtoconfigurethecontrollertomatchtheinputdevice,whichisnormallyathermocouple,RTDor

process transmitter. When you select an input device, the controller automatically sets the input linearization

to match the sensor. It also sets high and low limits, which in turn limit the set point range-high and range-

low values.

Select the sensor type with Sensor Type [`Sen] (Setup Page, Analog Input Menu).

Note:

The EZ-ZONE PM does not have an open-sensor detection feature for process inputs.

Set Point Low Limit and High Limit

The controller constrains the Limit set point to a value between the Set Point Low Limit and the Set Point

High Limit.

Set the set point range with Set Point Low Limit [sp;ll] and Set Point HighLimit [sp;lh] (Setup Page,

Loop Menu).

Unfiltered Input Signal

Time

Temperature

Filter Time Constant

Filtered Input Signal

Time

Temperature

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 110 111

No comments

Watlow EZ-ZONE PM User Manual Page 78